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I'm looking at two integrated circuit packages: SOIC and SOP. They seem (almost) identical (pitch, overall size, etc...)

SOP

SOIC

Is there any important differences between these two packages that I am overlooking?

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    \$\begingroup\$ Unfortunately, the packaging industry seems to be in a mess, smaller packages come in huge variety of widths and HEIGHTS. Note: it is not just SOP, it is 8-SOP-225, looks like an arbitrary number. Then VSSOP, MSSOP, TSSOP go... there are "package names" and "supplier cases", you never know unless carefully check the datasheet and particular IC suffix. \$\endgroup\$ – Ale..chenski Jul 21 '17 at 17:54
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Yes, there are subtle differences that may or may not affect a particular design. For example, look at the specified package height from the bottom of the pins to the top of the body.

Whether differences like these are "important" depend on your application. Never trust the manufacturer's package name. You must manually step through all relevant dimensions.

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